CVE-2023-25933: A type confusion bug in TypedArray prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could have been us

This month

CRITICAL 9.8REMOTEMITIGATE

CVE-2023-25933 is a critical-severity flaw (CVSS 9.8) affecting hermes. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A type confusion bug in TypedArray prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could have been used by a malicious attacker to execute arbitrary code via untrusted JavaScript. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-843
Published	2023-05-18
Last modified	2026-06-17

Publisher (CNA): Facebook, Inc. · Vendor: facebook

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-05-18 22:15 UTCPublished CVE record published
2026-06-17 05:42 UTCUpdated Record last modified

facebook hermes MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hermes || rpm -q hermes || hermes --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-25933?

hermes: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-25933 being exploited?

CVE-2023-25933 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-25933 affect?

CVE-2023-25933 affects hermes. Severity is critical (CVSS 9.8). A type confusion bug in TypedArray prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could have been used by a malicious attacker to execute arbitrary code via untrusted JavaScript. Note that this is only exploitable in cases where H

How urgent is CVE-2023-25933?

Priority 54/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

React vulnerabilities

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CVE-2023-30470 CRITICAL 9.8 MITIGATE A use-after-free related to unsound inference in the bytecode generation when optimizations are enabled for He
CVE-2023-28081 CRITICAL 9.8 MITIGATE A bytecode optimization bug in Hermes prior to commit e6ed9c1a4b02dc219de1648f44cd808a56171b81 could be used t
CVE-2023-24833 HIGH 7.5 UPGRADE A use-after-free in BigIntPrimitive addition in Hermes prior to commit a6dcafe6ded8e61658b40f5699878cd19a481f8

References

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